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(1) Checking Crystal Circuit
TEST POINT
Figure 4.3.1
CIRCUIT
n
L
C
X
1
0
0
E
X
S
0
0
A
-
C
S
0
1
0
0
0
4
3
G
N
D
X
T
A
L
1
2
T
E
R
1
T
E
R
2
2
6
M
H
z
1 pin
1Pin
Figure 4.3.2
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
X100
#1 pin : 26MHz
B
T
_
R
X
D
U
S
F I
2
_
R
X
D
H
7
B
T
_
R
T
S
U
S
F I
2
_
R
T
S
J
8
B
T
_
C
T
S
U
S
F I
2
_
C
T
S
A
2
U
A
R
T
_
T
X
U
S
F I
1
_
T
X
D
B
3
U
A
R
T
_
R
X
U
S
F I
1
_
R
X
D
A
3
D
_
R
E
S
E
T
U
S
F I
1
_
R
T
S
B
2
E
O
C
U
S
F I
1
_
C
T
S
K
1
1
U
S
B
_
D
P
D
P
L
U
S
K
1
2
U
S
B
_
D
M
D
M
N I
U
S
B
1
1
X
O
X
A
1
1
X
O
4. TROUBLE SHOOTING
CHECKING FLOW
26 MHz O.K?
Yes
Crystal is OK.
See next page to check PLL Circuit
WAVEFORM
_
M
R
S
T
_
N
_
N
_
M
T
S
R
_
M
R
S
T
_
N
_
N
Figure 4.3.3
72/140
72/140
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4. TROUBLE SHOOTING
No
Replace X100
LGE Internal Use Only
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